12. White light reflected at perpendicular incidence from a soap film has, in the visible spectrum, an interference maximum at 6000 Å and a minimum at 4500 Å, with no minimum in between. If n = 1.33 for the film, what is the film thickness, assumed uniform?
(A) 1450 Å
(B) 2670 Å
(C) 3380 Å
(D) 5120 Å
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統計: 尚無統計資料
統計: 尚無統計資料